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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Derivative Financial Instruments      
Notional Amount $ 21,791,262,000   $ 21,351,715,000
Estimated Fair Value Gain 413,388,000   414,742,000
Estimated Fair Value Loss 412,740,000   410,137,000
Gain or loss recorded 41,000 $ 0  
Interest Rate Derivatives, at Fair Value, Net 4,000   5,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Fair value of forward commitments (412,168,000)   (410,137,000)
Other Liabilities      
Derivative Financial Instruments      
Interest Rate Derivative Liabilities, at Fair Value 409,000,000.0   408,800,000
Other Assets      
Derivative Financial Instruments      
Interest Rate Derivative Assets, at Fair Value 409,000,000.0   408,800,000
Mortgage loan pipeline      
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Obligation 263,976,000   264,000,000
Expected closures      
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Obligation 241,672,000   233,265,000
Cash flow hedge | Cash and Cash Equivalents | Borrower      
Derivative Financial Instruments      
Collateral provided 29,800,000    
Cash flow hedge | Interest-bearing deposits (Liability) | Counterparty      
Derivative Financial Instruments      
Cash collateral 124,800,000    
Interest rate contracts      
Derivative Financial Instruments      
Notional Amount 21,400,000,000   20,800,000,000
Mortgage servicing rights hedging | Non-designated hedges      
Derivative Financial Instruments      
Notional Amount 85,000,000.0   205,000,000.0
Estimated gain (loss) on fair value (3,100,000)   1,200,000
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities      
Derivative Financial Instruments      
Notional Amount 85,000,000   205,000,000
Estimated Fair Value Gain     1,228,000
Estimated Fair Value Loss 3,084,000    
Mortgage loan pipeline commitments hedging      
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Obligation 256,000   4,759,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets      
Derivative Financial Instruments      
Notional Amount 277,500,000   324,000,000
Estimated Fair Value Gain 4,381,000   4,738,000
Forward commitments      
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Obligation 277,500,000   324,000,000
Fair value of forward commitments 4,124,000   (21,000)
Customer swaps | Cash flow hedge | Investment securities - available for sale      
Derivative Financial Instruments      
Collateral provided 262,100,000    
Foreign exchange swaps      
Derivative Financial Instruments      
Gain or loss recorded 0 $ 0  
Interest rate swap | Fair Value Hedging | Counterparty      
Derivative Financial Instruments      
Notional Amount 18,100,000   15,700,000
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty      
Derivative Financial Instruments      
Notional Amount 18,078,000   15,716,000
Estimated Fair Value Loss 645,000   1,355,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower      
Derivative Financial Instruments      
Notional Amount 10,706,435,000   10,404,605,000
Estimated Fair Value Gain 106,122,000   408,776,000
Estimated Fair Value Loss 363,248,000   69,998,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty      
Derivative Financial Instruments      
Notional Amount 10,704,249,000   10,402,394,000
Estimated Fair Value Gain 302,885,000    
Estimated Fair Value Loss $ 45,763,000   $ 338,784,000